21222020210 has 32 divisors (see below), whose sum is σ = 40454318592. Its totient is φ = 7987956480.

The previous prime is 21222020153. The next prime is 21222020219. The reversal of 21222020210 is 1202022212.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21222020219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1354079 + ... + 1369661.

It is an arithmetic number, because the mean of its divisors is an integer number (1264197456).

Almost surely, 2^21222020210 is an apocalyptic number.

21222020210 is a deficient number, since it is larger than the sum of its proper divisors (19232298382).

21222020210 is a wasteful number, since it uses less digits than its factorization.

21222020210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23618.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21222020210 its reverse (1202022212), we get a palindrome (22424042422).

The spelling of 21222020210 in words is "twenty-one billion, two hundred twenty-two million, twenty thousand, two hundred ten".